Date:   Thu, 17 Jun 2021 18:19:14 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        lkft-triage@...ts.linaro.org,
        open list <linux-kernel@...r.kernel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>
Subject: Re: [next] [clang] s390: clang: error: unable to execute command:
 Segmentation fault (core dumped)

The git bisect found the first bad commit,

On Thu, 17 Jun 2021 at 17:57, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
>
> Linux next 20210617 tag following s390 builds failed with clang-10,
> clang-11 and clang-12.
>
> Regressions found on s390:
>
>  - build/clang-11-tinyconfig
>  - build/clang-11-allnoconfig
>  - build/clang-12-allnoconfig
>  - build/clang-12-defconfig
>  - build/clang-10-tinyconfig
>  - build/clang-11-defconfig
>  - build/clang-10-allnoconfig
>  - build/clang-12-tinyconfig
>  - build/clang-10-defconfig
>
> Build log:
> ------------
> make --silent --keep-going --jobs=8
> O=/home/tuxbuild/.cache/tuxmake/builds/current ARCH=s390
> CROSS_COMPILE=s390x-linux-gnu- 'HOSTCC=sccache clang' 'CC=sccache
> clang'
> PLEASE submit a bug report to https://bugs.llvm.org/ and include the
> crash backtrace, preprocessed source, and associated run script.
> Stack dump:
> 0.Program arguments: /usr/lib/llvm-12/bin/clang -cc1 -triple
> s390x-unknown-linux-gnu -S -disable-free -disable-llvm-verifier
> -discard-value-names -main-file-name core.c -mrelocation-model pic
> -pic-level 2 -pic-is-pie -fno-delete-null-pointer-checks -mllvm
> -warn-stack-size=2048 -mframe-pointer=none -relaxed-aliasing
> -fmath-errno -fno-rounding-math -no-integrated-as
> -mconstructor-aliases -target-cpu zEC12 -target-feature +soft-float
> -mbackchain -mpacked-stack -msoft-float -mfloat-abi soft
> -fno-split-dwarf-inlining -debug-info-kind=limited -dwarf-version=4
> -debugger-tuning=gdb -nostdsysteminc -nobuiltininc -resource-dir
> /usr/lib/llvm-12/lib/clang/12.0.1 -dependency-file
> kernel/sched/.core.o.d -MT kernel/sched/core.o -isystem
> /usr/lib/llvm-12/lib/clang/12.0.1/include -include
> /builds/linux/include/linux/compiler-version.h -include
> /builds/linux/include/linux/kconfig.h -include
> /builds/linux/include/linux/compiler_types.h -I
> /builds/linux/arch/s390/include -I ./arch/s390/include/generated -I
> /builds/linux/include -I ./include -I
> /builds/linux/arch/s390/include/uapi -I
> ./arch/s390/include/generated/uapi -I /builds/linux/include/uapi -I
> ./include/generated/uapi -D __KERNEL__ -D __PACK_STACK -D
> CONFIG_AS_CFI_VAL_OFFSET=1 -D CC_USING_NOP_MCOUNT -D CC_USING_FENTRY
> -I /builds/linux/kernel/sched -I ./kernel/sched -D
> KBUILD_MODFILE=\"kernel/sched/core\" -D KBUILD_BASENAME=\"core\" -D
> KBUILD_MODNAME=\"core\" -D __KBUILD_MODNAME=kmod_core
> -fmacro-prefix-map=/builds/linux/= -O2 -Wall -Wundef
> -Werror=strict-prototypes -Wno-trigraphs
> -Werror=implicit-function-declaration -Werror=implicit-int
> -Werror=return-type -Wno-format-security
> -Werror=unknown-warning-option -Wno-sign-compare -Wno-frame-address
> -Wno-address-of-packed-member -Wno-format-invalid-specifier -Wno-gnu
> -Wno-unused-const-variable -Wdeclaration-after-statement -Wvla
> -Wno-pointer-sign -Wno-array-bounds -Werror=date-time
> -Werror=incompatible-pointer-types -Wno-initializer-overrides
> -Wno-format -Wno-sign-compare -Wno-format-zero-length
> -Wno-pointer-to-enum-cast
> -Wno-tautological-constant-out-of-range-compare -std=gnu89
> -fno-dwarf-directory-asm -fdebug-compilation-dir
> /home/tuxbuild/.cache/tuxmake/builds/current -ferror-limit 19 -pg
> -mfentry -mnop-mcount -mrecord-mcount -fwrapv -fno-signed-char
> -fwchar-type=short -fno-signed-wchar -fgnuc-version=4.2.1
> -vectorize-loops -vectorize-slp -o /tmp/core-eaad47.s -x c
> /builds/linux/kernel/sched/core.c
> 1.<eof> parser at end of file
> 2.Code generation
> 3.Running pass 'Function Pass Manager' on module
> '/builds/linux/kernel/sched/core.c'.
> 4.Running pass 'SystemZ DAG->DAG Pattern Instruction Selection' on
> function '@...ce_event_raw_event_sched_switch'
>  #0 0x00007f7227e2e693 llvm::sys::PrintStackTrace(llvm::raw_ostream&,
> int) (/usr/lib/x86_64-linux-gnu/libLLVM-12.so.1+0xd12693)
>  #1 0x00007f7227e2c9b0 llvm::sys::RunSignalHandlers()
> (/usr/lib/x86_64-linux-gnu/libLLVM-12.so.1+0xd109b0)
>  #2 0x00007f7227e2ecff (/usr/lib/x86_64-linux-gnu/libLLVM-12.so.1+0xd12cff)
>  #3 0x00007f722f7cb140 __restore_rt
> (/lib/x86_64-linux-gnu/libpthread.so.0+0x14140)
>  #4 0x00007f7227dba772 llvm::LLT::print(llvm::raw_ostream&) const
> (/usr/lib/x86_64-linux-gnu/libLLVM-12.so.1+0xc9e772)
>  #5 0x00007f72284a850b
> llvm::SelectionDAGBuilder::visitInlineAsm(llvm::CallBase const&)
> (/usr/lib/x86_64-linux-gnu/libLLVM-12.so.1+0x138c50b)
>  #6 0x00007f722848ade7
> llvm::SelectionDAGBuilder::visit(llvm::Instruction const&)
> (/usr/lib/x86_64-linux-gnu/libLLVM-12.so.1+0x136ede7)
>  #7 0x00007f72285198b9
> llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction,
> false, false, void>, false, true>,
> llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction,
> false, false, void>, false, true>, bool&)
> (/usr/lib/x86_64-linux-gnu/libLLVM-12.so.1+0x13fd8b9)
>  #8 0x00007f722851926a
> llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&)
> (/usr/lib/x86_64-linux-gnu/libLLVM-12.so.1+0x13fd26a)
>  #9 0x00007f7228516fa6
> llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&)
> (/usr/lib/x86_64-linux-gnu/libLLVM-12.so.1+0x13fafa6)
> #10 0x00007f7229f07742 (/usr/lib/x86_64-linux-gnu/libLLVM-12.so.1+0x2deb742)
> #11 0x00007f722813b09e
> llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
> (/usr/lib/x86_64-linux-gnu/libLLVM-12.so.1+0x101f09e)
> #12 0x00007f7227f5619d
> llvm::FPPassManager::runOnFunction(llvm::Function&)
> (/usr/lib/x86_64-linux-gnu/libLLVM-12.so.1+0xe3a19d)
> #13 0x00007f7227f5bb83 llvm::FPPassManager::runOnModule(llvm::Module&)
> (/usr/lib/x86_64-linux-gnu/libLLVM-12.so.1+0xe3fb83)
> #14 0x00007f7227f567ef
> llvm::legacy::PassManagerImpl::run(llvm::Module&)
> (/usr/lib/x86_64-linux-gnu/libLLVM-12.so.1+0xe3a7ef)
> #15 0x00007f722e092be6
> clang::EmitBackendOutput(clang::DiagnosticsEngine&,
> clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
> clang::TargetOptions const&, clang::LangOptions const&,
> llvm::DataLayout const&, llvm::Module*, clang::BackendAction,
> std::unique_ptr<llvm::raw_pwrite_stream,
> std::default_delete<llvm::raw_pwrite_stream> >)
> (/usr/lib/x86_64-linux-gnu/libclang-cpp.so.12+0x1614be6)
> #16 0x00007f722e32bd9f (/usr/lib/x86_64-linux-gnu/libclang-cpp.so.12+0x18add9f)
> #17 0x00007f722d487054 clang::ParseAST(clang::Sema&, bool, bool)
> (/usr/lib/x86_64-linux-gnu/libclang-cpp.so.12+0xa09054)
> #18 0x00007f722ea20268 clang::FrontendAction::Execute()
> (/usr/lib/x86_64-linux-gnu/libclang-cpp.so.12+0x1fa2268)
> #19 0x00007f722e9adcf1
> clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
> (/usr/lib/x86_64-linux-gnu/libclang-cpp.so.12+0x1f2fcf1)
> #20 0x00007f722ea83282
> clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
> (/usr/lib/x86_64-linux-gnu/libclang-cpp.so.12+0x2005282)
> #21 0x0000000000413352 cc1_main(llvm::ArrayRef<char const*>, char
> const*, void*) (/usr/lib/llvm-12/bin/clang+0x413352)
> #22 0x00000000004116ce (/usr/lib/llvm-12/bin/clang+0x4116ce)
> #23 0x00000000004114de main (/usr/lib/llvm-12/bin/clang+0x4114de)
> #24 0x00007f7226c50d0a __libc_start_main
> (/lib/x86_64-linux-gnu/libc.so.6+0x26d0a)
> #25 0x000000000040e88a _start (/usr/lib/llvm-12/bin/clang+0x40e88a)
> clang: error: unable to execute command: Segmentation fault (core dumped)
> clang: error: clang frontend command failed due to signal (use -v to
> see invocation)
> Debian clang version 12.0.1-+rc1-1
> Target: s390x-unknown-linux-gnu
> Thread model: posix
> InstalledDir: /usr/local/bin
> clang: note: diagnostic msg:
> ********************
>
> PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
> Preprocessed source(s) and associated run script(s) are located at:
> clang: note: diagnostic msg: /tmp/core-86ba67.c
> clang: note: diagnostic msg: /tmp/core-86ba67.sh
> clang: note: diagnostic msg:
>
> ********************
> make[3]: *** [/builds/linux/scripts/Makefile.build:272:
> kernel/sched/core.o] Error 254

The first bad commit:
commit 3abbdfde5a6588a92209cd8b131769b8058e7c21
Author: Heiko Carstens <hca@...ux.ibm.com>
Date:   Wed Jun 9 22:59:13 2021 +0200
    s390/bitops: use register pair instead of register asm

    Get rid of register asm statement and use a register pair.
    This allows the compiler to allocate registers on its own.

    Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
    Signed-off-by: Vasily Gorbik <gor@...ux.ibm.com>
 arch/s390/include/asm/bitops.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
Previous HEAD position was 3abbdfde5a65 s390/bitops: use register pair
instead of register asm
HEAD is now at 7d9c6b8147bd Add linux-next specific files for 20210617

>
> ref:
> https://builds.tuxbuild.com/1u4ZMVtVqiZtUcCrP9YE89mx9iU/
>
> Build:
> --------
>     git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
>     git_sha: 7d9c6b8147bdd76d7eb2cf6f74f84c6918ae0939
>     git_short_log: 7d9c6b8147bd (\Add linux-next specific files for 20210617\)
>     kconfig: defconfig
>     target_arch: s390
>     toolchain: clang-12
>
> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>

- Naresh

> --
> Linaro LKFT
> https://lkft.linaro.org

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